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Whether a one-time spray treatment to control mosquitoes is enough depends on multiple factors. Often, you’ll notice a big difference after one application. However, mosquitoes are likely to return if you don't reduce attractive standing water habitats. This usually takes four to eight weeks if it’s still prime mosquito season.

All herbicides come with risks, but you can control and mitigate risks by discussing your options with your weed service company before application. Some companies use milder or sustainable herbicides more times per season to control weeds rather than one to two herbicide sprayings annually. You can also ask your professional about pet-friendly and kid-friendly services. In most cases, though, you can wait a few days after the application for the herbicides to soak into the ground, at that point they shouldn’t pose a risk to you or your family.

Mowing your grass regularly, especially if you’re mowing close to the ground, can help kill Johnsongrass. Frequent mowing helps limit the spread of Johnsongrass and can even deplete carbohydrate reserves in rhizomes over time. The more time you leave in between mowing, the more likely Johnsongrass is to regrow and take over your lawn. 

It usually takes between two weeks and a month for weeds to fully die off after you spray them with herbicide, but they will start to wilt within the first week. Different weed sprays produce different results, with some working more quickly and effectively than others. Similarly, some weeds are killed more easily than others. Consult your weed removal pro for an exact timeline based on their weed removal method.